Lifting-jack.



'310.845,657. PATENTBDPEB. 26, 19o?.

QWQR. LEROY. LIFTING JACK.

' APPLICATION FILED DEG. Q, 1906..

y "rinrrnn srarns PATENT lorries;

WILLIAM n. LEROY, or QCEANPARK, oanigronnm.

LaFraise-JACK.

To all whom t concern: Be it known that l, WILLIAM R. LEROY, a

citizen of the United States, residing atv Qceanparlr, in the county of Los Angeles,

State of California, have invented a new and useful Lifting-Jack, of which the follon'ring is a specification.

The main object of this invention is to provide a lifting-j ack vof simple and eiiicient con-v struction. Y

A further object of the invention is to provide a lifting-j ack wherein the slightest move,- inent of the operating-arm will catch and rotate the jack so that there is substantially no loss of motion, such as is involved in thel case of ordinary ratchet movements.

Another object "of the invention is to provide a lifting- 1 ack of this character in which the vertical movement can readily be reversed.

ln the accompanying drawings, Figure 1 isy a vertical section oi the jack. Fig. 21s a plan of the up rotating means or friction clutch device on the line in Fig. 1. Fig. 8

is a similar view of the down rotating means on the line 933 in Fig. 1. Fig. 4 is aside elevation of one of the rotating members.

1 designates the base or body of the jack, provided with a handle 2 and with. a screwthreaded portion 3, in which engages the screw-threaded stein i of the jack. Above this screw-threaded portion the jack has a flange or shoulder portion 5 and extends above the shoulder in the form of a vertical arbor 6, provided at its upper end with a bearing, preferably formed as a rounded knob 7, to support lthe head 8, which is freely rotatable on the jack and serves to take the weight or pressure of the'object to be raised without interfering with the rotation of the jack. .A'- key-or pin 28 is driven into and fits tightly in ,a hole in the head 8 v,and projects laterally into an annular grooveQQin the arbor portion 6 to hold the head from coming off. e Two clutch devices or-rotators 9 1() are arrangedr around the arbor portion 6 of the jack and turn re'el y thereon. Each'of these clutch devices'is provided witha projection A12, having an opening 13r"or the reception of a suitable operating-handle, (not shown,) and each of said clutch devices is formed as ak cyiind rical box having a cylindrical recess 15 in its upper face to receive an inner clutch member '16 or 17, which is'secured to the shaftor arbor portion 6 of the jack, as by means of a key l. Each oi the inner clutch members v1 i Specification of Letters Patent., ,k Application and December 4, 1906. sean no. "Stasia,

" y Patentamt. 26,1907.

1.6 17 is provided withaseriesof pockets or recesses191in its Aperipherall uppervportion, v

said. ockets being open outwardly and" having t eny inner walls 19 extending obliquely outward andL forward in a given rotative'direction' to form a'series of cnrvedratchetteeth and notches. In the pockets or spaces thus formed between the inner clutch member 16 and the outer clutch members 9 or 1'() are placed balls 2 0. The bottom or iloor oi each pocket is inclined downwardly and ioniA ward in the saine rotative direction Vor rolir the broad end of eachpocket tothe ta ering or narrow: end thereof, so that the ball t erein willl tend to roll .toward the narrow end. The

taper oi the pockets of the `upper clutch de-` outer clutch member 9 10 is 'covere Aby a top a suitable handle or ro of any kind is placed` f l in the hole 18 oi" one of the outer clutch rneni-` est bers, and by reciprocating the handle back' and forth' a vibratory movement is imparted tothe outer clutch member. In one stroke of such vibratory movement the balls 20 in the oclrets 19 roll away irornthe narrow end of tie pocket-s, so as to turn :freely without pinching during suclistroke. `in the reverse stroke of the handle and .the outer` clutch` member the balls'are rolled forwardly toward f the narrow end of the-pockets, so as to pinch" or wedge between the walls of the o ckets and the wall of the outer clutch noem `'er and carry the inner clutch member'andtheat-` tached jack around with the handle. When the jack is to be lowered, the handle is placed in the other clutch member, and reciproca-- zoo tion of the handle will then cause lowering' oi `the jack by similar operation to that above described.

. 1. lAli'fing-jack comprising a body, a jack member-screwed there1nto,an inner -clutch `member secured to the-jack member and having pockets formed therein, said pockets hav- ,ing-their inner walls extended obliquely outwary and forward in a given rotative direcf `tionand having their floors 'extending lob:

ltion: eah inner clutch member and having a cylindrical inner surface, and balls m said pockets liquely downward in the same rotative direc? member screwed thereinto, two innerolutch .members secured to the jack member and having pockets formed therein, said pockets having their inner walls extendedobliquely outward and forward in agiven rotative direcn tion and having their floors extending obliquely downward in the same rotative direcan outer clutch member surrounding to engage or run free of the inner surface of the outer Clutch member and the said oblique walls of the inner clutch member, said outer clutch member being provided with operating means.

tion, an outer clutch 3. A'lifting-jaok comprising a body, a jack member screwed thereinto, twoinner clutch members secured to the jack member and having pockets formed therein, said pocketsv having their inner walls extended obliquely outward and forward in a given rotative direction and having their ioors extending obliquely downward in the same rotative direc member surrounding each inner olutoh member and having; a oy? lindrieal inner-surface, and balls in said pockets to engage or run Jfree of the inner surface of the outer clutch memberand the said'oblique walls of the inner clutch member, said outer clutch member being provided with 4o operating means and with dustrproof caps detachably secured thereto.

I 1n testimony whereof -I-'have hereunto set my hand, at Los Angeles, California, this 26th day of November, 1906.

`WILL`IAM R. LEROY.

1n presence oi'-.

ARTHUR P. KNIGHT, FRANK L. AGRAnAM. 

